US9400560B2 - Image display device and display control method thereof - Google Patents

Image display device and display control method thereof Download PDF

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Publication number
US9400560B2
US9400560B2 US12/889,471 US88947110A US9400560B2 US 9400560 B2 US9400560 B2 US 9400560B2 US 88947110 A US88947110 A US 88947110A US 9400560 B2 US9400560 B2 US 9400560B2
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hand
operating region
user
display device
image
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US20110080337A1 (en
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Takashi Matsubara
Masumi Moritani
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Maxell Ltd
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Hitachi Maxell Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
    • G06K9/00355—
    • G06K9/00375—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/107—Static hand or arm
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/20—Movements or behaviour, e.g. gesture recognition
    • G06V40/28—Recognition of hand or arm movements, e.g. recognition of deaf sign language

Definitions

  • the present invention relates to an image display device and a display control method thereof. More particularly, the present invention relates to an image display device that visually recognizes a user's gesture to enhance the user-friendliness of an interface giving instructions to an electronic device, and a display control method thereof.
  • users of a TV, a video recorder, or other video device or a PC or other information processing device generally entered data or commands with a keyboard or a pointing device, such as a mouse, or performed a channel selection or image display procedure with a remote controller.
  • An image recognition device disclosed, for instance, in Japanese Patent No. 4318056 recognizes the form and motion of hands and fingers and identifies an intended operation.
  • the image recognition device disclosed in Japanese Patent No. 4318056 creates an operating plane on a marker corresponding to a body position, and recognizes instructions in accordance with the positional movement of a hand or finger in the operating plane.
  • the operating plane is a virtual operating plane.
  • an operator 102 can perform an input procedure with ease by extending his/her hand 601 to an operating plane 701 which is virtually defined in accordance with a marker 101, or by moving the hand 601 so as to touch a part of the screen of a monitor 111 and the operating plane 701 in the same manner as for a touch panel.”
  • the timing of calibration cannot be determined with ease because the position of the operating plane is determined before the operator extends his/her hand. If, in particular, there are two or more persons in front of the screen, it is practically impossible to select one person as a target for which an operating region is to be defined.
  • Processing load is increased because the body position is to be recognized.
  • Positioning is difficult to achieve when, for instance, the operator is in a lying position.
  • Another conceivable method is to recognize a user's hand and define the region of an operating plane in accordance with the position of the hand.
  • the processing load is low when merely the hand is to be recognized. The reason is that recognition can be achieved with relative ease by grasping the characteristics of the hand.
  • FIG. 8 illustrates a case where the operating region is created near the waist of a user when the user extends his/her hand from below.
  • the operating region 80 When, for instance, the user extends his/her hand from below, the operating region 80 is created near the user's waist as the moving hand is positioned close to the waist, as shown in FIG. 8 .
  • the operating region 80 created in this manner is positioned apart from an operating region 81 that is presumed to be handled by the user. Consequently, the user cannot perform an operation with ease.
  • the present invention has been made to address the above problems, and provides an easy-to-operate image display device that recognizes a user's hand and defines an operating region in accordance with the user's intention without imposing a significant processing load on itself.
  • the image display device picks up an image of a user with a camera or other imaging means, causes image recognition means to recognize an image presented by image data acquired by the imaging means, and issues instructions concerning a user's operation in accordance with the result of image recognition.
  • the image recognition means recognizes the position of a hand of the user, and causes operating region setup means to predefine an operating region, on an imaging region plane of the imaging means and around a position on which the user's hand is projected, for the purpose of enabling the user to issue instructions to the image display device.
  • the operating region setup means then moves the operating region within the imaging region plane in accordance with the relative positional relationship between the position on which the user's hand is projected and the operating region.
  • the operating region moves in the direction of the movement of the position on which the user's hand is projected, and is then set at a position reached by the projection of the user's hand.
  • the image recognition means recognizes a hand-waving motion of the user
  • the operating region setup means sets the size of the operating region in accordance with the magnitude of the user's hand-waving motion.
  • FIG. 1 is a diagram illustrating the configuration of an image display device according to a first embodiment of the present invention.
  • FIGS. 2A and 2B are diagrams illustrating an operating region that is to be provided by the image display device according to the first embodiment of the present invention.
  • FIGS. 3A to 3C are diagrams illustrating the flow of an operating region setup process performed by the image display device according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating the steps of the operating region setup process performed by the image display device according to the first embodiment of the present invention.
  • FIG. 5 is a diagram illustrating the configuration of the image display device according to a second embodiment of the present invention.
  • FIGS. 6A to 6C are diagrams illustrating the flow of the operating region setup process performed by the image display device according to the second embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating the steps of the operating region setup process performed by the image display device according to the second embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a case where the operating region is created near the waist of a user when the user extends his/her hand from below.
  • Embodiments of the present invention will be described below with reference to FIGS. 1 to 7 .
  • FIGS. 1 to 4 A first embodiment of the present invention will now be described with reference to FIGS. 1 to 4 .
  • FIG. 1 is a diagram illustrating the configuration of the image display device according to the first embodiment of the present invention.
  • the image display device 100 includes an input unit 110 , a system control unit 120 , a video signal processing unit 130 , and a display unit 140 .
  • the input unit 110 picks up an image of a user.
  • the input unit for example, is an infrared camera, stereo camera, or RGB camera having a TOF (time-of-flight) sensor function.
  • the camera used as the input unit 110 is not specifically limited to the above-mentioned ones. Any camera may be used as the input unit 110 as far as it is capable of eventually picking up an image for converting an acquired image to digital data for the purpose of performing image recognition with respect to the user.
  • the system control unit 120 detects the position of a hand of the user, and performs data processing to predefine an operating region at an appropriate position.
  • the system control unit 120 may be implemented by allowing a CPU to execute a software module stored in a memory or by using a dedicated hardware circuit.
  • the system control unit 120 includes portions that implement the functions of a hand position detection unit 121 , a position judgment processing unit 122 , and an operating region setup unit 123 .
  • the hand position detection unit 121 detects a hand position from digital image data.
  • the position judgment processing unit 122 determines the positional relationship between the hand position and the operating region.
  • the operating region setup unit 123 predefines the operating region.
  • the video signal processing unit 130 receives instructions and data from the system control unit 120 and creates a video signal for displaying an image on the display unit 140 .
  • the display unit 140 presents an image to the user in accordance with the video signal.
  • the display unit is an LCD (Liquid Crystal Display), PDP (Plasma Display Panel), or other display device having a display.
  • FIGS. 2 and 3 An operating region setup process performed by the image display device 100 according to the first embodiment of the present invention will now be described with reference to FIGS. 2 and 3 .
  • FIGS. 2A and 2B are diagrams illustrating an operating region that is to be provided by the image display device 100 according to the first embodiment of the present invention.
  • FIGS. 3A to 3C are diagrams illustrating the flow of the operating region setup process performed by the image display device 100 according to the first embodiment of the present invention.
  • FIG. 2A An operation of the image display device 100 according to the first embodiment of the present invention is as shown in FIG. 2A .
  • the user 30 makes a gesture while viewing the display 10 .
  • the image display device 100 then recognizes an image of the gesture, determines the operating region in accordance with the result of recognition, and prompts the user 30 to enter, for instance, a necessary command into the operating region.
  • an infrared camera 12 is installed under the display 10 .
  • An LED 14 of the infrared camera 12 emits near-infrared rays.
  • a lens 16 receives resulting reflected rays to pick up an image of the user 30 .
  • a key point of the present embodiment in particular, is to recognize a user's hand.
  • the hand 32 is a part of the body of the user 30 that is readily recognizable. It is assumed that the employed infrared camera 12 is a 3D camera capable of measuring the distance between the hand and a display screen.
  • the image display device 100 When the image display device 100 performs image recognition and detects the hand 32 , it determines the operating region 20 relative to an operating screen 18 of the display 10 according to the position at which the hand is detected.
  • the operating region 20 is a virtual region where the user 30 is supposed to perform an operation. It is assumed that the operating region 20 is created in an imaging region plane 22 of the infrared camera 12 that corresponds to a position at which the user 30 stands. As shown in FIG. 2B , the operating region 20 is an enlarged/reduced version of the operating screen 18 of the display 10 and positioned in the imaging region plane 22 in front of the user. At first, the operating region 20 is determined so that the hand 32 of the user 30 is positioned at the center of the operating region 20 . Then, as shown in FIG.
  • the operating screen 18 displays a pointer 26 at a position corresponding to the position of the hand 32 of the user 30 , in the operating region 20 .
  • the pointer 26 shown in FIG. 2B is shaped like a hand, it may alternatively be shaped, for instance, like an arrow mark, a circle, square, or other basic form, or a popular animation character.
  • the operating region 20 is determined in accordance with the position of the hand 32 and the distance between the hand 32 and the operating screen 18 so that an extended line of the hand 32 points to the screen. Therefore, the user 30 can issue instructions to the image display device 100 in a manner similar to the manner of using a hands-free laser pointer.
  • the operating region 20 is invisible to the user 30 .
  • the user 30 does not particularly have to be aware of the position and size of the operating region. While the user performs a natural operation, the operating region dynamically becomes corrected.
  • the pointer 26 in the operating screen 18 also moves rightward.
  • the operating region 20 can move in this manner as far as the imaging region plane 22 is not exceeded. In other words, when the position at which the hand 32 of the user 30 is detected moves and comes close to the periphery of the operating region 20 , the operating region 20 moves in the direction of movement of the position at which the hand 32 of the user 30 is detected.
  • the user 30 can now perform an operating procedure for the image display device 100 with respect to the operating region 20 that is set at a new position. Referring to FIG. 3C , when the user 30 repositions his/her hand 32 at the center of the operating region, the pointer 26 in the operating screen 18 also appears at the center of the operating screen 18 .
  • FIG. 4 is a flowchart illustrating the steps of the operating region setup process performed by the image display device 100 according to the first embodiment of the present invention.
  • the process for predefining the operating region 20 is performed by the system control unit 120 shown in FIG. 1 .
  • the system control unit 120 analyzes data fed from the input unit 110 to perform a process for recognizing the hand 32 of the user 30 .
  • step S 401 is performed to predefine the operating region 20 in accordance with the position of the hand 32 .
  • the pointer 26 appears in the operating screen 18 .
  • step S 402 is performed to recognize changes in the position of the hand 32 and move the pointer 26 in the operating screen 18 in accordance with the position of the hand 32 .
  • Step S 403 is then performed to judge whether the hand 32 is recognized again. If the hand 32 cannot be recognized (when, for instance, the user 30 has lowered the hand 32 or moved the hand 32 out of the imaging region plane 22 ), step S 407 is performed to delete the operating region 20 . In this instance, the pointer 26 is also deleted from the operating screen 18 . Upon completion of step S 407 , the system control unit 120 returns to step S 400 .
  • step S 405 is performed to judge whether the hand 32 is positioned at an end of the operating region 20 and about to move out of the operating region. If so, step S 408 is performed to move the operating region 20 in accordance with the movement of the hand 32 . In other words, the operating region 20 follows the movement of the hand 32 .
  • the system control unit 120 Upon completion of step S 408 , the system control unit 120 returns to step S 402 .
  • step S 406 When, in step S 406 , the user 32 indicates his/her intention to terminate an operation, for instance, by pressing a “Finish” button in the operating region 20 , the system control unit 120 terminates the process. If no such indication is given in step S 406 , the system control unit 120 returns to step S 402 .
  • FIGS. 5 to 7 A second embodiment of the present invention will now be described with reference to FIGS. 5 to 7 .
  • a display control method provided by the image display device 100 according to the first embodiment is implemented by using an interface that causes the operating region to follow the movement of the user's hand.
  • the image display device according to the second embodiment offers an interface that not only provides the same display control method as the first embodiment, but also determines the size of the operating region in accordance with the movement of the user's hand.
  • FIG. 5 is a diagram illustrating the configuration of the image display device according to the second embodiment of the present invention.
  • the image display device 100 according to the second embodiment includes the input unit 110 , the system control unit 120 , the video signal processing unit 130 , and the display unit 140 , as is the case with the image display device 100 according to the first embodiment.
  • the image display device 100 according to the second embodiment differs from the image display device 100 according to the first embodiment in that the system control unit 120 of the former image display device additionally includes a hand-waving motion detection unit 124 .
  • the hand-waving motion detection unit 124 detects a hand-waving motion of the user 30 .
  • FIGS. 6A to 6C are diagrams illustrating the flow of the operating region setup process performed by the image display device 100 according to the second embodiment of the present invention.
  • the position and size of the operating region 20 are calibrated in accordance with the position and magnitude of a hand-waving motion at the beginning of an operation.
  • the user 30 can intentionally adjust the size of the operating region 20 . If, for instance, the user 30 waves his/her hand slightly, a small operating region 20 a is created as shown in FIG. 6A . If, on the other hand, the user 30 waves his/her hand greatly, a large operating region 20 b is created as shown in FIG. 6B .
  • the above-described hand-waving motion is a distinguishing operation that can easily be differentiated from the other motions (operations).
  • FIG. 6C indicates that the hand 32 of the user 30 is waved to generate the operating region 20 and determine its size, and that the hands 33 and 34 of the other persons are irrelevant.
  • a system for moving the operating region in the direction of the movement of the hand 32 of the user 30 can be established by implementing a scheme for dynamically correcting the calibrated operating region.
  • FIG. 7 is a flowchart illustrating the steps of the operating region setup process performed by the image display device 100 according to the second embodiment of the present invention.
  • the process for predefining the operating region 20 is performed by the system control unit 120 shown in FIG. 5 .
  • the system control unit 120 analyzes data fed from the input unit 110 to perform a process for recognizing the hand 32 of the user 30 .
  • step S 501 is performed to judge whether a hand-waving motion is recognized. If a hand-waving motion is recognized, step S 502 is performed to predefine the operating region 20 in accordance with the position and magnitude of the hand-waving motion. In this instance, the pointer 26 appears in the operating screen 18 .
  • step S 503 is performed to recognize changes in the position of the hand 32 and move the pointer 26 in the operating screen 18 in accordance with the position of the hand 32 .
  • Step S 504 is then performed to judge whether the hand 32 is recognized again. If the hand 32 cannot be recognized, step S 507 is performed to delete the operating region 20 . In this instance, the pointer 26 is also deleted from the operating screen 18 . Upon completion of step S 507 , the system control unit 120 returns to step S 500 .
  • step S 505 is performed to judge whether the hand 32 is positioned at an end of the operating region 20 and about to move out of the operating region. If so, step S 508 is performed to move the operating region 20 in accordance with the movement of the hand 32 . In other words, the operating region 20 follows the movement of the hand 32 .
  • the system control unit 120 Upon completion of step S 508 , the system control unit 120 returns to step S 503 .
  • step S 506 the system control unit 120 terminates the process. If no such indication is given in step S 506 , the system control unit 120 returns to step S 503 .
  • the display control method of the image display device according to the present invention differs from the conventional technology described in Japanese Patent No. 4318056 and makes it possible to determine the position of the operating region without regard to the position and attitude of the body of a user when the user extends his/her hand.
  • a person who extends his/her hand can be identified as an operator no matter whether there are two or more persons.
  • the display control method of the image display device according to the present invention dynamically changes the operating region in accordance with the movement of the user's hand after the operating region is predefined. This provides increased ease of operation because the timing of calibration need not be determined in the middle of an operation.
  • the present invention provides an easy-to-operate image display device that recognizes a user's hand and defines the operating region in accordance with the user's intention without imposing a significant processing load on itself.
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